<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <div id="app">
        请输入张三的成绩：<input type="text" v-model="score">
        <h2 v-if="score>=90 && score<=100">张三的成绩优秀</h2>
        <h2 v-if="score>=75 && score<90">张三的成绩良好</h2>
        <h2 v-if="score>=60 && score<75">张三的成绩及格</h2>
        <h2 v-if="score>=0 && score<60 && score!=null && score!='' ">张三的成绩不及格</h2>
    </div>
</body>
<script>
    var vue = new Vue({
        el:"#app",
        data:{
            score:null
        }
    })
</script>
</html>